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Poster: Cocopugg Date: Dec 29, 2004 10:05am
Forum: prelinger Subject: Why were the mpeg2 files created in a non-compliant DVD format?

First of all, I have to say I love this site, it brings back so many incredible memories. Now secondly, I have to compliment the quality of the files on this site, however, I have to wonder, why were the mpeg2 files created in a non-compliant DVD format? For NTSC, the DVD compliant format must be either 352x240, 352x480, 704x480 or 720x480, but the mpeg2 files on this site have the non-dvd compliant resolution of 368x480. Don't get me wrong, I love watching the quality on my computer, but there is no way to actually author these files to watch them on a stand alone home DVD player. Is there a reason why they weren't captured at the proper DVD resolution? Thanks for the replies in advance.

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Poster: Rick Prelinger Date: Dec 29, 2004 12:19pm
Forum: prelinger Subject: Re: Why were the mpeg2 files created in a non-compliant DVD format?

Here's an old thread on this subject:

http://www.archive.org/iathreads/post-view.php?id=18638

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Poster: Cocopugg Date: Dec 29, 2004 2:27pm
Forum: prelinger Subject: Re: Why were the mpeg2 files created in a non-compliant DVD format?

Thanks for the reply Rick. I am new to this forum, so I guess I really don't understand a few things, like, if these classics were all originally encoded at non-DVD standards, is there any reason they can't today be re-encoded at the proper resolution for burning to DVD? I'm not sure if maybe the reason is that you no longer have access to the original source and these high quality files will be the only versions we'll have to live with. I do believe if the originals still exist, and there's any way of properly re-digitizing them for DVD burn, it would be the way to go. Also, I don't know if it's just me, but on my computer, the sound on most of these files start to go off sync as the files play further and further into the clips. That is to say that when the picture first starts to play, the sound is fine, but as we go several minutes into the film, you can notice the audio going further and further off sync. Is this also a problem of the non-DVD compliant resolution? Thanks for the reply.

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Poster: Steve Nordby Date: Dec 29, 2004 10:00pm
Forum: prelinger Subject: Re: Why were the mpeg2 files created in a non-compliant DVD format?

I don't think it was mentioned in the earlier thread, but you'll notice the older films' mpeg2s split the film into file sizes that fit on CD. I would guess that the reduced horizontal resolution was also choosen because it helped reduce file size. I'm sure the Archive has access to the originals, but it's a huge number of films, so I'd bet re-encoding is unlikely to happen any time soon. The newer (within the last couple of years) mpeg2's in the Prelinger Archive are 704x480 and burn fine looking DVD's.

You said there's no way to burn DVD's from the non-comlaint mpegs, but that's not really true. You can re-encode them. In fact the authoring program that came with my burner will do it automatically, and any low cost video editing program (Videowave, Video Explosion Deluxe, Video Studio - each under $100) could do it as well and let you edit together films that have been split into parts at the same time. There are probably some free utilities that can re-encode too.

Sound sync problems are common in both mpeg1 and 2 players, esp. if you try to skip ahead or fast forward a clip. It is possible to get the sound sync off in the encoding, but I haven't had any sync problems playing from the start and just letting them go.